overkiller 

A word popular amongst people who play MUDs or other MMORPGS. To kill with an excessive amount of force usually in unfair Player VS Player fights.

In a Mud I use to play (called MUME) this was the most classic example:
Player1 attempts to fight Player2 in a fair fight. Player2 gets his ass kicked and calls for backup. Player1 gets trapped or Spam killed by Player2, Player3, Player4 and Player 5.

overkiller by Chris F. March 7, 2005

Online Overkiller 

Someone on an online shooting game, who is killing players like mad without being killed.

"Holy Crap!", "He's killed me 17 times in a row and he hasn't even died yet he's an online overkiller."

Online Overkiller by Dole Banana July 16, 2009

Ghoulish Overkill

To speak in an over exaggerated tone in a disgusting manner to convey a point.

Morty: "... If you really want your grandpa back, grab a shovel, because the one that won't let you down is buried in the backyard."
Summer: "Your right!"
Morty: "What! No! I was using ghoulish overkill!"

from Rick and Morty, Season 3 Episode 1

Ghoulish Overkill by budobla April 4, 2019

overkill 

More than what is needed. In gross excess of what is reasonably expected. An excess of something beyond what is required or suitable for a given purpose.

Originally applied to nuclear weaponry.

"So, Bob, you ready to tear down that fence?" "Yeah, Chuck, the plastic explosives are all wired up!"

A 40-megaton nuke is overkill for destroying a farmhouse.

An Opteron 246 32-way server is overkill for typing up a paper.

overkill by eyard75 January 16, 2004

overkill software 

The company shovin up DLCs up your ass like it´s 1999.

Overkill Software makes excellent DLCs!

overkill software by DoctorPewtis November 21, 2015

Overkill Photographer 

Someone who posts multiple pictures of themselves from the

same time with different poses onto a social networking sight.

It's easy to spot an Overkill Photographer because they will

be wearing the same clothes and have the same background,

but will have changed their pose and possibly the camera

angle.

Mitch: Did you see Ashley's new pics on FB?

Alec: Yeah it was a little weird, she posted the same pic twice,

she just turned her hat around for one of them.

Mitch: She's such an Overkill Photographer

Overkill Photographer by Me and Mr. Split May 24, 2011

overseller 

1.When Someone Over reacts to the smallest and/or simplest things

2. When someone acts over reacts and making everything a big deal over a small problem/argument/event

pignoreo : OOOOO

Jake is offline

pignoreo : ooo

Jake is unable to receive Offline messages

^---- Translation: He blocked me for saying "OOOOO"

my response to this convo : wow what an overseller

overseller by TrueOwnage October 8, 2011